Before, GR, Spiked Scales, and Ravage were not associated with a skill. This is the sameas me picking up aMaul (I have no 2hc skill) and trying to hit mobs based entirely on my dexterity. It does work, but not well. NOW though, those 3 abilities are associated with Tooth & Claw. This means you are getting the %hit(dex) + %hit(T&C). This should increase your hit-to-miss ratio by quite a bit.

Everyone misses against spiders. I miss about 75%+ of the time against shadow spiders (The level 60-70 ones). This is with 1/3 of my training points dumped into my weapon skill (9/turn normally) + my armor fully teched with weapon skill (xbow in this case) and some dex. I also dumped some TP into dex.